Update all rules to better handle wrongly-typed configuration parameters.

helpers/helpers.js

@@ -465,7 +465,7 @@ module.exports.frontMatterHasTitle =
     const ignoreFrontMatter =
       (frontMatterTitlePattern !== undefined) && !frontMatterTitlePattern;
     const frontMatterTitleRe =
-      new RegExp(frontMatterTitlePattern || "^\\s*title\\s*[:=]", "i");
+      new RegExp(String(frontMatterTitlePattern || "^\\s*title\\s*[:=]"), "i");
     return !ignoreFrontMatter &&
       frontMatterLines.some((line) => frontMatterTitleRe.test(line));
   };

lib/md002.js

@@ -9,7 +9,7 @@ module.exports = {
   "description": "First heading should be a top level heading",
   "tags": [ "headings", "headers" ],
   "function": function MD002(params, onError) {
-    const level = params.config.level || 1;
+    const level = Number(params.config.level || 1);
     const tag = "h" + level;
     params.tokens.every(function forToken(token) {
       if (token.type === "heading_open") {

lib/md003.js

@@ -10,7 +10,7 @@ module.exports = {
   "description": "Heading style",
   "tags": [ "headings", "headers" ],
   "function": function MD003(params, onError) {
-    let style = params.config.style || "consistent";
+    let style = String(params.config.style || "consistent");
     filterTokens(params, "heading_open", function forToken(token) {
       const styleForToken = headingStyleFor(token);
       if (style === "consistent") {

lib/md004.js

@@ -11,7 +11,7 @@ module.exports = {
   "description": "Unordered list style",
   "tags": [ "bullet", "ul" ],
   "function": function MD004(params, onError) {
-    const style = params.config.style || "consistent";
+    const style = String(params.config.style || "consistent");
     let expectedStyle = style;
     const nestingStyles = [];
     flattenedLists().forEach((list) => {

lib/md007.js

@@ -11,7 +11,7 @@ module.exports = {
   "description": "Unordered list indentation",
   "tags": [ "bullet", "ul", "indentation" ],
   "function": function MD007(params, onError) {
-    const indent = params.config.indent || 2;
+    const indent = Number(params.config.indent || 2);
     const startIndented = !!params.config.start_indented;
     flattenedLists().forEach((list) => {
       if (list.unordered && list.parentsUnordered) {

lib/md009.js

@@ -12,9 +12,7 @@ module.exports = {
   "tags": [ "whitespace" ],
   "function": function MD009(params, onError) {
     let brSpaces = params.config.br_spaces;
-    if (brSpaces === undefined) {
+    brSpaces = Number((brSpaces === undefined) ? 2 : brSpaces);
-      brSpaces = 2;
-    }
     const listItemEmptyLines = !!params.config.list_item_empty_lines;
     const strict = !!params.config.strict;
     const listItemLineNumbers = [];

lib/md012.js

@@ -10,7 +10,7 @@ module.exports = {
   "description": "Multiple consecutive blank lines",
   "tags": [ "whitespace", "blank_lines" ],
   "function": function MD012(params, onError) {
-    const maximum = params.config.maximum || 1;
+    const maximum = Number(params.config.maximum || 1);
     let count = 0;
     forEachLine(lineMetadata(), (line, lineIndex, inCode) => {
       count = (inCode || line.trim().length) ? 0 : count + 1;

lib/md013.js

@@ -27,9 +27,11 @@ module.exports = {
   "description": "Line length",
   "tags": [ "line_length" ],
   "function": function MD013(params, onError) {
-    const lineLength = params.config.line_length || 80;
+    const lineLength = Number(params.config.line_length || 80);
-    const headingLineLength = params.config.heading_line_length || lineLength;
+    const headingLineLength =
-    const codeLineLength = params.config.code_block_line_length || lineLength;
+      Number(params.config.heading_line_length || lineLength);
+    const codeLineLength =
+      Number(params.config.code_block_line_length || lineLength);
     const strict = !!params.config.strict;
     const longLineRePostfix =
       strict ? longLineRePostfixStrict : longLineRePostfixRelaxed;

lib/md022.js

@@ -10,13 +10,9 @@ module.exports = {
   "tags": [ "headings", "headers", "blank_lines" ],
   "function": function MD022(params, onError) {
     let linesAbove = params.config.lines_above;
-    if (linesAbove === undefined) {
+    linesAbove = Number((linesAbove === undefined) ? 1 : linesAbove);
-      linesAbove = 1;
-    }
     let linesBelow = params.config.lines_below;
-    if (linesBelow === undefined) {
+    linesBelow = Number((linesBelow === undefined) ? 1 : linesBelow);
-      linesBelow = 1;
-    }
     const { lines } = params;
     filterTokens(params, "heading_open", (token) => {
       const [ topIndex, nextIndex ] = token.map;

lib/md024.js

@@ -9,8 +9,8 @@ module.exports = {
   "description": "Multiple headings with the same content",
   "tags": [ "headings", "headers" ],
   "function": function MD024(params, onError) {
-    const siblingsOnly = params.config.siblings_only ||
+    const siblingsOnly = !!params.config.siblings_only ||
-      params.config.allow_different_nesting || false;
+      !!params.config.allow_different_nesting || false;
     const knownContents = [ null, [] ];
     let lastLevel = 1;
     let knownContent = knownContents[lastLevel];

lib/md025.js

@@ -10,7 +10,7 @@ module.exports = {
   "description": "Multiple top level headings in the same document",
   "tags": [ "headings", "headers" ],
   "function": function MD025(params, onError) {
-    const level = params.config.level || 1;
+    const level = Number(params.config.level || 1);
     const tag = "h" + level;
     const foundFrontMatterTitle =
       frontMatterHasTitle(

lib/md026.js

@@ -11,9 +11,8 @@ module.exports = {
   "tags": [ "headings", "headers" ],
   "function": function MD026(params, onError) {
     let punctuation = params.config.punctuation;
-    if (punctuation === undefined) {
+    punctuation =
-      punctuation = allPunctuation;
+      String((punctuation === undefined) ? allPunctuation : punctuation);
-    }
     const trailingPunctuationRe =
       new RegExp("\\s*[" + escapeForRegExp(punctuation) + "]+$");
     forEachHeading(params, (heading) => {

lib/md029.js

@@ -17,7 +17,7 @@ module.exports = {
   "description": "Ordered list item prefix",
   "tags": [ "ol" ],
   "function": function MD029(params, onError) {
-    const style = params.config.style || "one_or_ordered";
+    const style = String(params.config.style || "one_or_ordered");
     flattenedLists().forEach((list) => {
       if (!list.unordered) {
         let listStyle = style;

lib/md030.js

@@ -10,10 +10,10 @@ module.exports = {
   "description": "Spaces after list markers",
   "tags": [ "ol", "ul", "whitespace" ],
   "function": function MD030(params, onError) {
-    const ulSingle = params.config.ul_single || 1;
+    const ulSingle = Number(params.config.ul_single || 1);
-    const olSingle = params.config.ol_single || 1;
+    const olSingle = Number(params.config.ol_single || 1);
-    const ulMulti = params.config.ul_multi || 1;
+    const ulMulti = Number(params.config.ul_multi || 1);
-    const olMulti = params.config.ol_multi || 1;
+    const olMulti = Number(params.config.ol_multi || 1);
     flattenedLists().forEach((list) => {
       const lineCount = list.lastLineIndex - list.open.map[0];
       const allSingle = lineCount === list.items.length;

lib/md033.js

@@ -18,8 +18,9 @@ module.exports = {
   "description": "Inline HTML",
   "tags": [ "html" ],
   "function": function MD033(params, onError) {
-    const allowedElements = (params.config.allowed_elements || [])
+    let allowedElements = params.config.allowed_elements;
-      .map((element) => element.toLowerCase());
+    allowedElements = Array.isArray(allowedElements) ? allowedElements : [];
+    allowedElements = allowedElements.map((element) => element.toLowerCase());
     forEachLine(lineMetadata(), (line, lineIndex, inCode) => {
       let match = null;
       // eslint-disable-next-line no-unmodified-loop-condition

lib/md035.js

@@ -9,7 +9,7 @@ module.exports = {
   "description": "Horizontal rule style",
   "tags": [ "hr" ],
   "function": function MD035(params, onError) {
-    let style = params.config.style || "consistent";
+    let style = String(params.config.style || "consistent");
     filterTokens(params, "hr", function forToken(token) {
       const lineTrim = token.line.trim();
       if (style === "consistent") {

lib/md036.js

@@ -9,7 +9,9 @@ module.exports = {
   "description": "Emphasis used instead of a heading",
   "tags": [ "headings", "headers", "emphasis" ],
   "function": function MD036(params, onError) {
-    const punctuation = params.config.punctuation || allPunctuation;
+    let punctuation = params.config.punctuation;
+    punctuation =
+      String((punctuation === undefined) ? allPunctuation : punctuation);
     const re = new RegExp("[" + punctuation + "]$");
     // eslint-disable-next-line jsdoc/require-jsdoc
     function base(token) {

lib/md041.js

@@ -9,7 +9,7 @@ module.exports = {
   "description": "First line in file should be a top level heading",
   "tags": [ "headings", "headers" ],
   "function": function MD041(params, onError) {
-    const level = params.config.level || 1;
+    const level = Number(params.config.level || 1);
     const tag = "h" + level;
     const foundFrontMatterTitle =
       frontMatterHasTitle(

lib/md043.js

@@ -11,7 +11,7 @@ module.exports = {
   "tags": [ "headings", "headers" ],
   "function": function MD043(params, onError) {
     const requiredHeadings = params.config.headings || params.config.headers;
-    if (requiredHeadings) {
+    if (Array.isArray(requiredHeadings)) {
       const levels = {};
       [ 1, 2, 3, 4, 5, 6 ].forEach(function forLevel(level) {
         levels["h" + level] = "######".substr(-level);

lib/md044.js

@@ -10,7 +10,8 @@ module.exports = {
   "description": "Proper names should have the correct capitalization",
   "tags": [ "spelling" ],
   "function": function MD044(params, onError) {
-    const names = params.config.names || [];
+    let names = params.config.names;
+    names = Array.isArray(names) ? names : [];
     const codeBlocks = params.config.code_blocks;
     const includeCodeBlocks = (codeBlocks === undefined) ? true : !!codeBlocks;
     names.forEach((name) => {

lib/md046.js

@@ -14,7 +14,7 @@ module.exports = {
   "description": "Code block style",
   "tags": [ "code" ],
   "function": function MD046(params, onError) {
-    let expectedStyle = params.config.style || "consistent";
+    let expectedStyle = String(params.config.style || "consistent");
     params.tokens
       .filter((token) => token.type === "code_block" || token.type === "fence")
       .forEach((token) => {

lib/md048.js

@@ -9,7 +9,7 @@ module.exports = {
   "description": "Code fence style",
   "tags": [ "code" ],
   "function": function MD048(params, onError) {
-    const style = params.config.style || "consistent";
+    const style = String(params.config.style || "consistent");
     let expectedStyle = style;
     params.tokens
       .filter((token) => token.type === "fence")

test/markdownlint-test.js

@@ -1589,12 +1589,14 @@ tape("validateConfigSchema", (test) => {
   const jsonFileRe = /\.json$/i;
   const resultsFileRe = /\.results\.json$/i;
   const jsConfigFileRe = /^jsconfig\.json$/i;
+  const wrongTypesFileRe = /wrong-types-in-config-file.json$/i;
   const testDirectory = __dirname;
   const testFiles = fs.readdirSync(testDirectory);
   testFiles.filter(function filterFile(file) {
     return jsonFileRe.test(file) &&
       !resultsFileRe.test(file) &&
-      !jsConfigFileRe.test(file);
+      !jsConfigFileRe.test(file) &&
+      !wrongTypesFileRe.test(file);
   }).forEach(function forFile(file) {
     const data = fs.readFileSync(
       path.join(testDirectory, file),

test/wrong-types-in-config-file.json

@@ -0,0 +1,91 @@
+{
+  "MD002": {
+    "level": "1"
+  },
+  "MD003": {
+    "style": 0
+  },
+  "MD004": {
+    "style": 0
+  },
+  "MD007": {
+    "indent": "2",
+    "start_indented": 0
+  },
+  "MD009": {
+    "br_spaces": "2",
+    "list_item_empty_lines": 0,
+    "strict": 0
+  },
+  "MD010": {
+    "code_blocks": 1
+  },
+  "MD012": {
+    "maximum": "1"
+  },
+  "MD013": {
+    "code_block_line_length": "80",
+    "code_blocks": 1,
+    "headers": 1,
+    "heading_line_length": "80",
+    "headings": 1,
+    "line_length": "80",
+    "strict": 0,
+    "tables": 1
+  },
+  "MD022": {
+    "lines_above": "1",
+    "lines_below": "1"
+  },
+  "MD024": {
+    "allow_different_nesting": 0,
+    "siblings_only": 0
+  },
+  "MD025": {
+    "front_matter_title": 0,
+    "level": "1"
+  },
+  "MD026": {
+    "punctuation": 0
+  },
+  "MD029": {
+    "style": 0
+  },
+  "MD030": {
+    "ol_multi": "1",
+    "ol_single": "1",
+    "ul_multi": "1",
+    "ul_single": "1"
+  },
+  "MD031": {
+    "list_items": 1
+  },
+  "MD033": {
+    "allowed_elements": 0
+  },
+  "MD035": {
+    "style": 0
+  },
+  "MD036": {
+    "punctuation": 0
+  },
+  "MD041": {
+    "front_matter_title": 0,
+    "level": "1"
+  },
+  "MD043": {
+    "headers": 0,
+    "headings": 0
+  },
+  "MD044": {
+    "code_blocks": 1,
+    "names": 0
+  },
+  "MD046": {
+    "style": 0
+  },
+  "MD048": {
+    "style": 0
+  },
+  "$schema": "../schema/markdownlint-config-schema.json"
+}

test/wrong-types-in-config-file.md

@@ -0,0 +1,3 @@
+# Wrong Types in Config File
+
+Long line long line long line long line long line long line long line long line long line long line {MD013}